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Evaluation of measurement uncertainty of urine output using two kinds of urine bags
Med Biol Sci Eng 2018;1(1):31-37
Published online January 31, 2018
© 2018 Medical Biological Science and Engineering.

Hyo Jung Son1, Tae Woong Kim1, Han Byeol Oh1, Yoon Ji Choi2

1Department of Anesthesia and Pain Medicine, National Police Hospital, Seoul, 2Department of Anesthesia and Pain Medicine, Pusan National University Yangsan Hospital, Yangsan, Korea
Correspondence to: Yoon Ji Choi
Department of Anesthesia and Pain Medicine, Pusan National University Yangsan Hospital, 20 Geumo-ro, Mulgeum-eup, Yangsan 50612, Korea
Tel: +82-55-920-5632
Fax: +82-55-360-2149
E-mail: yoonji07@gmail.com
Received October 30, 2017; Revised November 24, 2017; Accepted December 1, 2017.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Measurement of the urine output is helpful in the diagnosis of urinary diseases, including the kidney. However, the various types of urine bags available have many factors that can influence the measurements of the urine output. Therefore, this study examined the measurement uncertainty of the urine output using two types of urine bags. Two types of commonly used urine bags (urine bag with collecting chamber: urine bag A, and urine bag only: urine bag B) were evaluated. The volume of the contents in the urine bags was measured after injecting either 30 mL or 300 mL of water into the urine bags. The volume of injected water was determined considering the urine bag scale and definition of oliguria, which indicated below 0.5 mL/kg/h. When an average of 30.1 mL of water was injected into urine bag A, the measured value was distributed within ±2.4 mL (7.0%) with a 95% probability. When an average of 30 mL of water was injected into urine bag B, the measured value was distributed within ±6.4 mL (21.3%) with a 95% probability. When an average of 300 mL of water was injected into urine bag B, the measured value was distributed within ±58.1 mL (19.4%) with a 95% probability. This study revealed the measurement uncertainty of the urine output using two types of urine bags. Considering the uncertainty of the measurement, even if the urine volume is within this range, clinically suspected oliguria should be considered and observed closely, and active treatment may be required.
Keywords : Uncertainty; Urine bag; Urine output
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